Handle HTTPException when attempting to get ssh_info

The call to `urlopen` can raise `HTTPException`, but this is not
caught which results in a python Traceback.

Add handling of the exception.  Because `HTTPException` and its
derived classes do not have any message, print the name of the
exception in the error message instead.

Change-Id: Ic90fb4cc0e92702375cd976d4a03876c8ce8bffc
1 file changed